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error propogation in polyfit

From: Kyndig
Subject: error propogation in polyfit
Date: Tue, 12 Feb 2008 23:01:16 -0800 (PST)

I can't seem to find any information about how to find the error propogated
through a polyfit.  More specifically, if I have an experimental error which
is equal for all data points and assumed to be random (gaussian
distribution) so that a least squares fit is applicable, I'd like to know
how to find the standard deviations for the estimators given by polyfit. 
Any suggestions would be greatly appreciated.  Thank you for your time!
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